JPH0219260Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a heat-sensitive recording material.

The thermosensitive recording method has been widely used in recent years due to its simplicity and maintenance-free equipment. As heat-sensitive recording materials used in heat-sensitive recording systems, those using leuco dyes and phenolic compounds, and transfer ribbons for thermal transfer coated with dye ink are known. Some of these methods have been proposed in which a heat-sensitive recording layer is pre-formed only on the required portions of the base material, but in this method, heat-sensitive recording layers of different shapes are provided on base materials of different sizes depending on the application. There is a need. Also, when trying to record a multicolor image in which images of different hues are superimposed using the conventional thermal recording method, it is possible to use a transfer tape that transfers only the thermally printed portion, but once the transfer is performed, the If the transfer is performed again on the transfer body, the image already formed by the transfer may be reversely transferred to the transfer tape used for the next transfer, or even if the image is not reversely transferred, the image may be distorted. be. Alternatively, in a system using a leuco dye, even if a transparent substrate is used, it is not preferable because color develops throughout.

The present invention was developed to solve the above-mentioned drawbacks of the prior art, and consists of a transparent substrate with a heat-sensitive recording layer formed on one side, and an adhesive layer formed on the other side of the transparent substrate. The gist thereof is a heat-sensitive recording material characterized by the following:

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a schematic cross-sectional view showing the structure of the heat-sensitive recording material of the present invention. In Figure 1, heat-sensitive recording material 1
A heat-sensitive recording layer 3 is formed on one side of a transparent base material 2, and an adhesive layer 4 is formed on the side of the transparent base material 2 on which the recording layer 3 is not provided.

In the above, the transparent base material 2 is cellophane,
selected from transparent synthetic resin films such as polypropylene film, polyvinyl chloride film, polyvinylidene chloride film, polyethylene terephthalate film, polycarbonate film, nylon film, cellulose diacetate film, cellulose triacetate film, polysulfone film, and polyimide film,
It is preferable to use a material that does not undergo thermal deformation at the thermal printing temperature and is mechanically difficult to stretch. Regarding the thickness, the image forming material of the present invention is attached to another base material after image formation, and is preferably attached in large numbers to obtain a multicolor image, so it is thin. There is no shift in the images of each layer depending on the viewing angle when using a device, and the thickness does not become excessive even when a large number of layers are stacked. In order to achieve this, the thickness of the transparent base material is preferably about 5 to 25 μm.

The above transparent substrate 2 may be appropriately subjected to corona treatment, oxidation treatment, primer treatment, etc. in order to improve the adhesiveness with the heat-sensitive recording layer 3 or adhesive layer 4.

Next, the heat-sensitive recording layer 3 formed on one side of the transparent substrate 2 will be explained. The heat-sensitive recording layer 3 has a composition containing, for example, a diazo compound, an alkaline substance, a coupling agent, other additives, and a binder. It can be formed using objects.

In the above, the diazo compound includes, for example,
Those described in Japanese Patent Publication No. 55-49730 can be used, or diazosulfonates corresponding to these can also be used.

As a coupling agent, the general formula is I can give an example of what is expressed as . However, in the above, R ¹ , R ² , R ³ , R ⁴ , R ⁵ are hydrogen, alkyl groups,
an aryl group, an alkoxy group, a sulfonic acid or sodium sulfonate group, an alkylamino group, an arylamino group, an amino group, a carboxylic acid group, a carboxylic acid ester group, or a halogen, and R ⁴ is an alkyl group, an aryl group, or a hetero a ring, R ⁶ is a sulfonic acid or sodium sulfonate group or a carboxyl group, R ⁷ and R ⁸
is the same as R ¹ , R ² , R ^{3 or R 5 and} a hydroxyl group, X is a halogen, m is an integer of 1 to 3, and n is 1 or 2. Of the above (A) and
Coupling agents belonging to (B) give blue or red dyes, those belonging to (C) give brown or blue dyes, and (D)
Those belonging to (E) and (E) give red or yellow dyes, and in addition to these, the following formula You can also use something like this.

Specifically, resorcinol and its derivatives 4
- 1-phenyl-3 which is benzoylresorcinol, 2-methylresorcinol, 5-methylresorcinol, diresorcinol and diresorcinol sulfide, phloroglycin, pyrazolones;
-Methyl-5-pyrazolone, 4,4'-bis(1-
phenyl-3-methyl-5-pyrazolone), 1-
(4'-sulfophenyl)-3-methyl-5-pyrazolone, naphthols include 2-hydroxy-
3-naphthoic acid-2'-ethoxyanilide, 2-hydroxy-3-naphthoic acid-2',5'-dimethoxyanilide, 2-hydroxy-3-naphthoic acid-
2'-Methoxy-5-nitroanilide, 2-hydroxy-3-naphthoic acid-2-methyl-4-chloroanilide, 2-hydroxy-3-naphthoic acid-morpholinopropioamide, 2-hydroxy-3-
Naphthoic acid ethanolamide, dihydroxynaphthalene, 2-hydroxy-3-naphthoic acid naphthamide, 1,8-dihydroxynaphthalene-3-
(or 4)-sodium sulfonate, sodium 1-hydroxy-8-benzoylaminonaphthalene-3-sulfonate, sodium 1-hydroxy-8-phenylaminonaphthalene-4-sulfonate, 1-hydroxy-8-methylamino Sodium naphthalene-5-sulfonate, sodium 1-hydroxynaphthalene-4-sulfonate, 2,8
- Sodium dihydroxynaphthalene-6-sulfonate.

As acidic coupling agents, 2-hydroxy-3-naphthoic acid, 2-hydroxy-6-naphthoic acid, 2-hydroxy-1-naphthoic acid, 2,6
-dihydroxybenzoic acid, 2,4-dihydroxybenzoic acid, 3,5-dihydroxybenzoic acid, 2,
4,6-trihydroxybenzoic acid and cyanoacetic acid, others, m-hydroxyphenylurea,
N,N-ethylenebisacetoacetamide, 2,
6-dihydroxyacetophenone, acetoacetanilide, 2,4,6-trihydroxyacetophenone, N-benzylacetoacetamide, catechol, acetoacetic benzamide, or alternatively 2,4-dihydroxybenzoic acid ethanolamide, 3,5 -Dihydroxybenzoic acid ethanolamide and the like can also be used.

As coupling agents it is also possible to use compounds which have in their structure a group in the form of a metal carboxylate salt as well as a coupling position. To give a specific example,
2-hydroxy-1-naphthoic acid, 2-hydroxy-3-naphthoic acid, 2-hydroxy-4-naphthoic acid, 2-hydroxy-6-naphthoic acid, 2,
3- (or 2,4-, 2,5-, 2,6-, 3,
4-,3,5-)dihydroxybenzoic acid, 2,
3,4- (or 2,4,6-, 3,4,5-)
Trihydroxybenzoic acid, 2-hydroxyanthracene-3-carboxylic acid, 3-hydroxybenzofuran-2-carboxylic acid, 2-hydroxycarbazole-3-carboxylic acid, 2-hydroxy-α-
Benzocarbazole-3-carboxylic acid, 1-
(4'-sulfophenyl)-3-carboxy-5-pyrazolone, 4,4'-methylenebis-(3-hydroxy-2-naphthoic acid)-2-(or 3-,4
-) metal salts of aromatic compounds such as acetoacetaminobenzoic acid, 3-(or 4-, 5-, 6-)acetoacetaminosalicylic acid, 5,5'-carboxyacetobenzidide.

Metals that form salts include monovalent or polyvalent metals such as lithium, sodium, potassium, calcium, magnesium, strontium, barium, aluminum, chromium, manganese, iron, cobalt, nickel, copper, zinc, or cadmium. You can choose whatever you like.

Among the compounds listed as having a group in the form of a carboxylic acid metal salt in the structure as well as a coupling position, particularly preferred are 2-hydroxy-1-naphthoic acid, 2-hydroxy-3-naphthoic acid, 2-hydroxy-3-naphthoic acid, 2-hydroxy-3-naphthoic acid, 2-hydroxy-3-naphthoic acid, 4-dihydroxybenzoic acid, 4-
acetoacetaminobenzoic acid or 4-acetoacetaminosalicylic acid, calcium, zinc,
Salts of strontium, manganese or cadmium.

Organic or inorganic alkaline substances,
A basic compound or a thermally decomposable alkali generator that generates an alkali by thermal decomposition can be used, and examples of organic compounds include urea, thiourea, aminopyridine, imidazole, phenylimidazole, guanidine, diphenylguanidine, and diphenylguanidine. -o
- As inorganic products such as tolylguanidine,
_{NH4HCO3 , NH4H2PO4 , ( NH4} ) _{2HPO4 ,}
Examples include (NH ₄ ) ₃ PO ₄ and NaHNH ₄ PO ₄ .

As for other components, it is desirable to add an acidic stabilizer in order to improve the storage stability of the diazo compound and the speed of photodecomposition during the fixing operation.
Monovalent to divalent or more fatty acids, specifically citric acid, oxalic acid, malonic acid, malic acid, adipic acid, maleic acid, etc. can be mentioned.

The binder is preferably (a) soluble in water, methanol or ethanol, which is a solvent for the diazo compound, and (b) softens or melts to an extent that facilitates the coloring reaction of the diazo compound during thermal printing. Can be mentioned. Polyvinyl alcohol, polyvinyl butyral,
polyvinyl acetal, polyvinyl formal,
Epoxy, polyacrylic acid, polymethacrylic acid,
Polymethacrylic acid ester, polyacrylate,
polyamide, polyvinyl chloride, polyvinyl acetate,
Synthetic or natural resins such as vinyl chloride/vinyl acetate copolymer, cellulose acetate, cellulose acetate butyrate, melamine, polyvinylpyrrolidone, gelatin, and casein can be mentioned. It is more preferable to use a binder having an acidic residue in terms of stabilizing the diazo compound and accelerating the rate of photodecomposition during fixing. Examples of such binders include styrene/maleic acid copolymer, isobutyl/ It is preferable to use a maleic acid copolymer or a vinyl chloride-vinyl acetate-maleic acid ternary copolymer resin.

A solvent or diluent is added to the above-described diazo compound, alkaline substance, coupling agent, other components, and binder to prepare a composition for forming a heat-sensitive recording layer.

In the above, the blending ratio of the diazo compound and the coupling agent is 1/0.5 to 1/5, more preferably 1/3 to 1/2. Further, the blending ratio of the diazo compound and the binder is 1/1 to 1/20, more preferably 1/3 to 1/10. The degree of alkalinity of the alkaline substance varies depending on the type of alkaline substance used, so it cannot be generalized, and it must be determined after conducting preliminary tests as appropriate. The minimum amount is sufficient to create an atmosphere where people feel comfortable.

However, as will be described later, the layer containing the alkaline substance may be separated from the layer containing the alkaline substance (for example, by the reference numeral 3 in FIG. 3).
For layer A), the alkaline substance/binder is 1/0.5 to 1/5, preferably 1/0.5 to 1/5.
It is about 2.

The composition prepared as described above is coated on one side of a transparent substrate using a known coating method such as gravure coating, roll coating, air knife coating, kiss coating, spray coating, continuous coating, dip coating, spinner coating, and wheeler coating. , brush coating, solid coating by silk screen, wire bar coating, flow coating, gravure printing, gravure offset printing, lithographic offset printing, dilithography, letterpress printing, intaglio printing, jet printing, silk screen printing, electrostatic printing. Then, a heat-sensitive recording layer is formed to have a thickness of about 1 to 5 μm.

As the heat-sensitive recording layer, in addition to the above-mentioned type that develops color under alkaline conditions, it is also possible to use one that develops color under neutral conditions; one example is 2,5-diethoxy(dimethoxy)-4-(4-tolylmercapto)benzenediazonium chloride as a diazo compound. The heat-sensitive recording layer may be constructed using the above-mentioned thermosensitive recording layer without containing an alkaline substance.

Next, the adhesive layer 4 formed on the back side of the transparent substrate, that is, the side on which the heat-sensitive recording layer is not formed, will be explained. The adhesive composition forming the adhesive layer 4 is a thermoplastic resin, for example, polyvinyl acetate,
Any transparent resin such as polyester, polyester polyol, vinyl chloride/vinyl acetate copolymer, polyacrylic acid, polyacrylic ester, polymethacrylic ester, ethylene/vinyl acetate copolymer, etc. It can be selected based on the material of the transparent substrate or its adhesion to the object to be recorded and pasted using the heat-sensitive recording material of the present invention, diluted with an appropriate solvent, and applied by a known coating method. By doing so, the adhesive layer 4 can be formed. The thickness of the adhesive layer 4 is not particularly limited, but is approximately 5 to 50 μm. As the adhesive, it is preferable to use a heat-activated so-called heat-sensitive adhesive.

To perform thermal recording using the above-described thermal recording material, thermal printing is first performed from the thermal recording layer side of the thermal recording material. Any type of thermal head can be used for thermal printing, such as line or matrix dot type, segment type, thermal type type, or thermal pen type, and the thermal energy required per dot is 0.1 to 5 mJ. be.

When diazo sulfonate is used as the diazo compound in the heat-sensitive recording layer, exposure to ultraviolet rays for activation is preferably carried out prior to thermal printing, thereby increasing the recording sensitivity.

After thermal printing is performed, the heat-sensitive recording layer is irradiated with ultraviolet rays to decompose the diazo compound in the areas where thermal printing has not been performed, fixing the image, and subsequently preventing unnecessary fogging. The ultraviolet rays used for fixing and activation may be those emitted from light sources such as ultra-high pressure mercury lamps, high pressure mercury lamps, low pressure mercury lamps, carbon arcs, xenon arcs, metal halide lamps, and the like.

After thermal printing and fixing are performed as described above, the adhesive layer is superimposed on another base material so as to be in contact with the other base material, and heated and pressed by a hot press or the like to adhere to the other base material. Other base materials can be selected and used as appropriate depending on the purpose, and examples include the following: (a) Form paper, thin paper, parchment paper, high-quality paper, art paper, etc. Paper, coated paper, paperboard, etc., (b) polyethylene film, polypropylene film, ionomer film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, polyethylene terephthalate film, polycarbonate film, nylon film, polystyrene film, ethylene Plastic film, plastic sheet or plastic plate such as vinyl acetate copolymer film, ethylene vinyl alcohol copolymer film, cellulose diacetate film, cellulose triacetate film, polysulfone film, polyimide film, (c), stainless steel, aluminum, copper,
Metal foils or plates made of lead, tin, etc., (d) natural fibers,
Woven or non-woven fabrics made of fibers such as chemical fibers and glass fibers, (e) Inorganic boards such as glass, concrete, and ceramics, (f) Wooden boards such as wood, plywood, and particle board, (g) Above (a) to (f) ) materials are laminated appropriately. Among these, to obtain high quality images, art paper, coated paper, white polyester film, etc. are exemplified, and when transparency is required, transparent plastic film or sheet is preferable, and among transparent plastic films, polyester and polycarbonate are preferable. Those with excellent heat resistance are preferred.

In the heat-sensitive recording material of the present invention as described above, a heat-sensitive recording layer is formed on the surface of a transparent substrate, and a transparent adhesive is formed on the surface opposite to the surface on which the heat-sensitive recording layer is formed. , since the heat-sensitive recording material is configured to be attached to another base material (object to be adhered),
The condition of the surface of the base material can be seen through the heat-sensitive recording material, and the texture of the surface of the base material can be effectively utilized.

As you can understand from the method in the above record,
By changing the components of the heat-sensitive recording material, for example, by changing the coupling agent to give an appropriate coloring hue, images with different hues can be created when the thermal printing and fixing are performed and the materials are stacked one after another and pasted onto other substrates. are visible as a mixture. This produces an effect similar to multicolor printing. Even though the effect is similar to multicolor printing,
Not only are areas of different hues lined up,
Using a predetermined color separation filter, yellow, red,
When recorded on a heat-sensitive recording material that produces indigo and black colors, and affixed to the same substrate in the same register, an image similar to a so-called color photograph can be obtained.

The basic structure of the heat-sensitive recording material of the present invention has been described above, and further examples of application of the present invention include the following.

As an application example (1), as shown in Fig. 2, the heat-sensitive recording layer is further protected on the surface of the heat-sensitive recording layer 3 of the heat-sensitive recording material, and the components in the heat-sensitive recording layer are transferred to the thermal head during thermal printing. For example, there is a heat-sensitive recording material 1' provided with a protective layer 5 for preventing so-called sticking, which is caused by adhesion to the surface of the substrate. The protective layer 5 can be formed by a known coating method using a coating composition made of a thermoplastic resin or a thermosetting resin mixed with a lubricant and a mold release agent. Ethyl cellulose, cellulose acetate propionate,
Cellulose derivatives such as nitrocellulose and cellulose acetate, styrene resins and styrene copolymer resins such as polystyrene and polyα-methylstyrene, acrylic or methacrylic such as polymethyl methacrylate, polyethyl methacrylate, polyethyl acrylate, and polybutyl acrylate. Resin alone or copolymer resin, rosin, rosin-modified maleic acid resin, rosin-modified phenol resin, rosin ester resin such as polymerized rosin, polyvinyl acetate resin, coumarone resin, vinyltoluene resin, vinyl chloride resin, polyester resin, polyurethane resin , butyral resin, polyamide resin, vinyl chloride-vinyl acetate copolymer resin, cyclized rubber, chlorinated rubber, etc., and a lubricant and a mold release agent are further blended with a solvent and a diluent. It can be prepared by adding an agent and kneading. Dot line type thermal printers use pressure as a thermal head during thermal printing, causing strong friction between the thermal recording material and the thermal head, making it effective to use lubricants and release agents.

The typical substances that serve as lubricants are metal soaps, namely metal salts of fatty acids such as lauric acid and stearic acid, but there are also the following substances:

Organic tin fatty acid salts such as dibutyl-tin dilaurate, dibutyl-tin dinonylate, fatty acid amides such as stearylamide, palmitylamide, oleylamide, bis fatty acid amides, higher ketones such as stearone, higher alcohols and their derivatives such as myristyl alcohol, cetyl alcohol. , stearyl alcohol, polyethylene glycol, polyglycerol. Hydrocarbons such as liquid paraffin, paraffin wax, microwax, polyethylene with a low degree of polymerization, as well as natural waxes such as carnauba wax, candelilla wax, beeswax, spermaceti wax, privet wax, montan wax.

Furthermore, the term "mold release agent" refers to an agent that is generally used for the purpose of improving mold release during processing of rubber or plastic. A wide variety of substances can serve as mold release agents, but the main ones include mineral oils, such as petroleum ethers, vegetable oils, such as olive oil or castor oil, petrolatum or lanolin, fatty acids, especially alkanoic or alkenoic acids having 11 to 24 carbon atoms, and The ester especially has 6 carbon atoms.
Esters with ~24 alkyl or alkenyl, esters of phosphites, especially phenyl or alkyl (8 to 13 carbon atoms), fatty acid esters of glycerin-sorbitan condensates, alkenoyl (7-21 carbon atoms) amino acid esters, fluorocarbons and These include Teflon and silicone.

The lubricant and mold release agent used to form the above-described protective layer may be incorporated into the heat-sensitive recording layer when the protective layer is not formed as described above. However, the effect of protection and prevention of statesking is better when a protective layer is formed separately.

As an application example (2), the heat-sensitive recording layer 3 may be divided into two layers, a layer 3A containing an alkaline substance and a layer 3B containing a substance other than the alkaline substance, as shown in FIG. The order of forming layers 3A and 3B is the third
It may be done as shown in the figure, or 3A and 3B may be replaced. Note that layer 3A containing an alkaline substance
In order to more efficiently isolate the alkaline substance from substances other than the alkaline substance in the layer 3B, it is preferable that the alkaline substance be dispersed in the binder rather than dissolved.

Further, as described above, when a thermosensitive recording layer is constructed using a diazo compound that develops a neutral color, it may be divided into a layer containing the diazo compound and a layer containing a coupling agent.

According to the present invention described above, since the obtained image can be pasted in an appropriate size at an appropriate position on an appropriate base material according to the purpose, it is possible to paste the obtained image in an appropriate size on an appropriate base material in advance. There is no inconvenience in forming the heat-sensitive recording layer by determining the size and position for each case. In addition, according to the present invention, the obtained image can be overlaid and pasted on other substrates, which eliminates the need for a conventional heat-sensitive recording layer in which only one type of coloring hue is produced, or inversion when using a transfer tape. There are no inconveniences caused by photos.

Examples are given below to more specifically explain the present invention.

Example 1 Paints having the following compositions were prepared.

Paint for primer layer (linear polyester resin (manufactured by DuPont, No.
49000) 1 part by weight cyclohexanone 5 〃 Methyl ethyl ketone 4 〃) Paint for heat-sensitive recording layer () (2,5-diethoxy-4-(4'-tolylmercapto)-sodium benzenediazosulfonate
1 part by weight 2-hydroxy-3-naphthoic acid 2 parts by weight Cellulose acetate propionate resin 5 (Manufactured by Eastman Kodak, CAP482-05)
Methyl cellosolve 6 Toluene 25 Ethanol 20) Adhesive layer paint (linear polyester resin 6 parts by weight (Toyobo, Pylon 200) Vinyl chloride/vinyl acetate copolymer 5 (Union Carbide, VAGH) Methyl ethyl ketone 11 parts by weight Toluene 18) Apply the above primer layer paint to the surface of a 12 μm thick polyester film using a coating rod so that the film thickness (dry) is 1 μm, and after drying, apply the above heat sensitive coating. Paint for recording layer ()
A similar coating method was used to form a coating over the plasma coating so that the coating thickness (dry) was 2 μm. Next, on the opposite side to the above-mentioned coated surface, that is, on the back side of the polyester film, the above-mentioned paint for an adhesive layer was used, and the same method as above was used to form a film with a thickness (dry) of 5 μm.

The heat-sensitive recording layer side of the heat-sensitive recording sheet obtained as described above was first exposed to activation light using a xenon flash with an energy of 600 J, and then thermal printing was performed with an energy of 1.5 mJ/dot using a line dot type thermal head. Further, the entire surface was subjected to fixing exposure using a catenon flash with an energy of 850 J to obtain a blue printed image.

Next, the adhesive layer-formed side of the heat-sensitive recording sheet on which the image has been formed is placed on top of the high-quality paper so as to be in contact with it, and the surface is heated and pressed for 5 seconds using a hot plate whose surface temperature is approximately 170°C. A sheet with an image was attached to the surface of high-quality paper.

Example 2 To form a protective layer that protects the heat-sensitive recording layer,
A protective layer paint having the following composition was prepared.

Paint for protective layer (Polymethyl methacrylate resin 1 part by weight (molecular weight approx. 70,000) Polyethylene wax 0.15 part by weight (BASF, AF wax) Fluorocarbon thermal release agent 0.25 (Toyo Soda, MOLDWIZ, F-57) ) Toluene 9.6 〃 ) Using the above coating material, apply it to the surface of the heat-sensitive recording layer of the heat-sensitive recording sheet obtained in Example 1 using a coating rod so that the coating thickness (when dry) is 1 μm, It was dried to form a protective layer. When printing is performed using the heat-sensitive recording sheet obtained in Example 2, it can be used in the same manner as in Example 1, and furthermore, the stagnation with respect to the thermal head during thermal printing is different from that of Example 1 without a protective layer. Although it was slightly hot, it was not as hot as in Example 2.

Example 3 In the composition of the heat-sensitive recording layer paint () of Example 1,
A paint for a heat-sensitive recording layer () in which 2-hydroxy-3-naphthoic acid was changed to 2-hydroxy-1-naphthoic acid and a paint for a heat-sensitive recording layer () in which N-acetoacetylaminosalicylic acid was similarly changed were prepared,
Heat-sensitive recording sheets () and () corresponding to the respective paints were prepared in the same manner as in Example 2 using paints for heat-sensitive recording layers () and ().

The heat-sensitive recording sheet obtained above was subjected to the same procedure as in Example 2 to obtain a red image for the heat-sensitive recording sheet () and a yellow image for the heat-sensitive recording sheet (). When the heat-sensitive recording sheet was pasted on top of high-quality paper in the order of blue, red, and yellow, along with a blue image obtained by coloring, a multicolor image was obtained, and the overlapping parts of the three colors were black. images were obtained.

Example 4 The same procedure as in Example 1 was carried out except that the following paint for heat-sensitive recording layer () was used instead of paint for heat-sensitive recording layer () and the coating method was changed to gravure coating, and the thickness of the heat-sensitive recording layer after drying was determined. It was set to 2 μm.

Paint for heat-sensitive recording layer (p-(N,N-diethylamino)benzene
1 part by weight diazochloride (1/2 zinc chloride double salt) Phloroglucinol 2 Vinyl chloride-biacetic acid-maleic acid copolymer resin 6 Methyl ethyl ketone 30 Ethanol 12 parts by weight) Next, an alkaline substance having the following composition was applied on the heat-sensitive recording layer. An alkaline layer coating material containing a release agent and a lubricant was applied by gravure coating to a coating thickness of 1 μm after drying.

Paint for alkaline layer (diphenylguanidine 10 parts by weight lecithin 1 polyethylene wax (AF wax) 1 vinyltoluene-butadiene copolymer resin 10 cyclohexane 90) The alkaline layer of the heat-sensitive recording sheet obtained as above Print from the side using a line dot type thermal head with an energy of 1.2 mJ/dot, and use a diazo copy machine to expose and fix for 10 seconds to obtain a red image, then print the recorded sheet on the surface of art paper. were bonded together by thermocompression.

The image thus provided on the surface of the art paper was substantially flat with almost no protrusion from the surface of the art paper.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the structure of the heat-sensitive recording material of the present invention, and FIGS. 2 and 3 are cross-sectional views showing the structure of an applied example of the heat-sensitive recording material of the present invention. 1... Heat-sensitive recording material, 2... Transparent base material, 3...
Thermosensitive recording layer, 4...Adhesive layer.

Claims (1)

[Scope of utility model registration request] A heat-sensitive recording material, characterized in that a heat-sensitive recording layer is formed on one side of a transparent base material, and a transparent adhesive layer is formed on the other side of the transparent base material.